Be careful when visiting demonstration units for condos that don't exist yet.
It's quite frequent the demo will be "slightly different" than the real thing since the demo is going to be a stand-alone construction.
Those differences can be with the size of the rooms, where the "finished" unit will be smaller because of the "utilities" like pipes, elevators, common spaces, corridors and such won't be accounted for in the demo unit. You could have a 1200 square feet space that is in fact, when all utilities and walls are up, leave you with less than 1000 square feet. but legally, you get the advertised 1200 square feet since the remaining space is occupied by stuff in your condo.
Sometimes, the demo will be voluntarily made bigger and, unless you take a measuring tape, you'll never know the 15X20 bedroom shown on the plan that looked so spacious was in fact 18X24 in the demo. Or that the living room that looked so open in the demo had 9-10 feet ceilings when the condo you're signing on only have 8 feet ones.
Basically, the plans you are signing for will show exactly what you'll get but what you'll see in the demo might be "better" and, unless you take a measuring tape and document those bigger dimensions and demand the plans to be corrected and match what you have visited, you are out of luck legally.
Just be very careful with those "to be built" condos.